Use of nae instead of "no" is incorrect for "no bad", "it's no that cold" and "that's nae happening."
Use of nae instead of "no" is correct for "nae chance", "nae bother" and even "nae danger", though I don't use the latter myself.
"It's nae that warm outside", "that's nae bad that", "he's nae very good." These are all incorrect uses of "nae."
Either "not" or "no" should be used in these sentences, you Doric freak show.
Dunfermline to be winning at half time is even money at Coral. Playing bottom of the league Brechin.
Not exactly free money but great value nonetheless.